FIVRE                                  

  Arcturus                     

 Eveready Raytheon      

Various tubes :

  GE UV 201A             West. UV 201A        RCA UX 201A           201A / 01A                               01A / UX-201A

       CUNNINGHAM CX-112-A                            RCA  UX 171A

    RCA UY224 (24) 24A                         RCA 235 (35)   RCA 35                       RCA UY227 (27) 

    CUNNINGHAM CX 345 (45)      RCA RADIOTRON 247 (47)     RCA  UX 280 (80)

      Philco 42                                    Cunningham C 324-A (24)

   Philips American series:

   F242 (corrispondente alla 24)                                              PH235 (35)            F209 (27)                F209A (27)

 Telefunken American series:

                             RES347 (47)  

     RENS 351 (51)      RENS 324 (24)